86 TRUNCATELLINA OP ABYSSINIA. 



3. Parietal lamella low ; base tapering downward. 



T. schilleri, no. 19. 

 Parietal lamella rather high ; base less tapering. 



T. similis, no. 20. 



The following account is taken from Jickeli, who collected 

 and described all of the Abyssinian species. 



18. TRUNCATELLINA LARDEA (Jickeli). PI. 9, figs. 6, 7, 8, 9. 



The shell is perforate, cylindric, brown, with an oily luster, 

 under the lens distantly, rather obliquely ribbed. Whorls 

 5-6, rather swollen, regularly increasing, parted by a deep 

 suture, the last slightly ascending in front. Aperture slightly 

 oblique, ovate, 3-plicate : a deeply entering lamelliform pari- 

 etal fold, a strong, obtuse columellar fold, seen in its entirety 

 only by rolling the shell to the left, and a strong, palatal 

 tooth, not entirely visible in a front view. Peristome white, 

 expanded, slightly reflected; margins scarcely converging, 

 joined by a very thin callus. Length 1.5, diam. 1 mm., length 

 and width of aperture 0.5 mm. (Jickeli). 



Abyssinia : Province Hamaszen on Rora-Beit-Andu about 

 4200 ft,, and Habab at the descent of Nakfa (Jickeli). 



Pupa lardea JICKELI, Fauna Moll. N.-O. Afrika's, in Nova 

 Acta Ac. Caes. Leop.-Carol. Germ. Nat. Cur., vol. 37, 1875, 

 p. 124, pi. 5, f. 14. 



"This species differs from the very closely related P. stro- 

 beli Grdl. by the more compact form, more widely spaced 

 longitudinal ribs, which are stouter and stronger. The Abys- 

 sinian snail, moreover, has a wider umbilicus and more convex 

 but lower whorls. The chief difference is in the armature of 

 the aperture, in form and situation of the teeth. 



"The denticle of the parietal wall is placed deep in the 

 mouth and bluntly pointed in strobeli, but in our species 

 emerges more, is higher and stronger, and penetrates inward 

 as a fold. 



"The columellar fold in our species is hardly visible in a 

 straight front view of the mouth, but appears, when the shell 

 is turned a little, as a very strong, blunted tooth, while in 

 strobeli it is very well shown in a direct front view and pro- 

 jects much less strongly. 



